File vendor/simplepie/simplepie/library/SimplePie/Parse/Date.php

  1 <?php
  2 /**
  3  * SimplePie
  4  *
  5  * A PHP-Based RSS and Atom Feed Framework.
  6  * Takes the hard work out of managing a complete RSS/Atom solution.
  7  *
  8  * Copyright (c) 2004-2012, Ryan Parman, Geoffrey Sneddon, Ryan McCue, and contributors
  9  * All rights reserved.
 10  *
 11  * Redistribution and use in source and binary forms, with or without modification, are
 12  * permitted provided that the following conditions are met:
 13  *
 14  *  * Redistributions of source code must retain the above copyright notice, this list of
 15  *    conditions and the following disclaimer.
 16  *
 17  *  * Redistributions in binary form must reproduce the above copyright notice, this list
 18  *    of conditions and the following disclaimer in the documentation and/or other materials
 19  *    provided with the distribution.
 20  *
 21  *  * Neither the name of the SimplePie Team nor the names of its contributors may be used
 22  *    to endorse or promote products derived from this software without specific prior
 23  *    written permission.
 24  *
 25  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS
 26  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
 27  * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS
 28  * AND CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 29  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 30  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 31  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 32  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 33  * POSSIBILITY OF SUCH DAMAGE.
 34  *
 35  * @package SimplePie
 36  * @version 1.3.1
 37  * @copyright 2004-2012 Ryan Parman, Geoffrey Sneddon, Ryan McCue
 38  * @author Ryan Parman
 39  * @author Geoffrey Sneddon
 40  * @author Ryan McCue
 41  * @link http://simplepie.org/ SimplePie
 42  * @license http://www.opensource.org/licenses/bsd-license.php BSD License
 43  */
 44 
 45 
 46 /**
 47  * Date Parser
 48  *
 49  * @package SimplePie
 50  * @subpackage Parsing
 51  */
 52 class SimplePie_Parse_Date
 53 {
 54     /**
 55      * Input data
 56      *
 57      * @access protected
 58      * @var string
 59      */
 60     var $date;
 61 
 62     /**
 63      * List of days, calendar day name => ordinal day number in the week
 64      *
 65      * @access protected
 66      * @var array
 67      */
 68     var $day = array(
 69         // English
 70         'mon' => 1,
 71         'monday' => 1,
 72         'tue' => 2,
 73         'tuesday' => 2,
 74         'wed' => 3,
 75         'wednesday' => 3,
 76         'thu' => 4,
 77         'thursday' => 4,
 78         'fri' => 5,
 79         'friday' => 5,
 80         'sat' => 6,
 81         'saturday' => 6,
 82         'sun' => 7,
 83         'sunday' => 7,
 84         // Dutch
 85         'maandag' => 1,
 86         'dinsdag' => 2,
 87         'woensdag' => 3,
 88         'donderdag' => 4,
 89         'vrijdag' => 5,
 90         'zaterdag' => 6,
 91         'zondag' => 7,
 92         // French
 93         'lundi' => 1,
 94         'mardi' => 2,
 95         'mercredi' => 3,
 96         'jeudi' => 4,
 97         'vendredi' => 5,
 98         'samedi' => 6,
 99         'dimanche' => 7,
100         // German
101         'montag' => 1,
102         'dienstag' => 2,
103         'mittwoch' => 3,
104         'donnerstag' => 4,
105         'freitag' => 5,
106         'samstag' => 6,
107         'sonnabend' => 6,
108         'sonntag' => 7,
109         // Italian
110         'lunedì' => 1,
111         'martedì' => 2,
112         'mercoledì' => 3,
113         'giovedì' => 4,
114         'venerdì' => 5,
115         'sabato' => 6,
116         'domenica' => 7,
117         // Spanish
118         'lunes' => 1,
119         'martes' => 2,
120         'miércoles' => 3,
121         'jueves' => 4,
122         'viernes' => 5,
123         'sábado' => 6,
124         'domingo' => 7,
125         // Finnish
126         'maanantai' => 1,
127         'tiistai' => 2,
128         'keskiviikko' => 3,
129         'torstai' => 4,
130         'perjantai' => 5,
131         'lauantai' => 6,
132         'sunnuntai' => 7,
133         // Hungarian
134         'hétfő' => 1,
135         'kedd' => 2,
136         'szerda' => 3,
137         'csütörtok' => 4,
138         'péntek' => 5,
139         'szombat' => 6,
140         'vasárnap' => 7,
141         // Greek
142         'Δευ' => 1,
143         'Τρι' => 2,
144         'Τετ' => 3,
145         'Πεμ' => 4,
146         'Παρ' => 5,
147         'Σαβ' => 6,
148         'Κυρ' => 7,
149     );
150 
151     /**
152      * List of months, calendar month name => calendar month number
153      *
154      * @access protected
155      * @var array
156      */
157     var $month = array(
158         // English
159         'jan' => 1,
160         'january' => 1,
161         'feb' => 2,
162         'february' => 2,
163         'mar' => 3,
164         'march' => 3,
165         'apr' => 4,
166         'april' => 4,
167         'may' => 5,
168         // No long form of May
169         'jun' => 6,
170         'june' => 6,
171         'jul' => 7,
172         'july' => 7,
173         'aug' => 8,
174         'august' => 8,
175         'sep' => 9,
176         'september' => 8,
177         'oct' => 10,
178         'october' => 10,
179         'nov' => 11,
180         'november' => 11,
181         'dec' => 12,
182         'december' => 12,
183         // Dutch
184         'januari' => 1,
185         'februari' => 2,
186         'maart' => 3,
187         'april' => 4,
188         'mei' => 5,
189         'juni' => 6,
190         'juli' => 7,
191         'augustus' => 8,
192         'september' => 9,
193         'oktober' => 10,
194         'november' => 11,
195         'december' => 12,
196         // French
197         'janvier' => 1,
198         'février' => 2,
199         'mars' => 3,
200         'avril' => 4,
201         'mai' => 5,
202         'juin' => 6,
203         'juillet' => 7,
204         'août' => 8,
205         'septembre' => 9,
206         'octobre' => 10,
207         'novembre' => 11,
208         'décembre' => 12,
209         // German
210         'januar' => 1,
211         'februar' => 2,
212         'märz' => 3,
213         'april' => 4,
214         'mai' => 5,
215         'juni' => 6,
216         'juli' => 7,
217         'august' => 8,
218         'september' => 9,
219         'oktober' => 10,
220         'november' => 11,
221         'dezember' => 12,
222         // Italian
223         'gennaio' => 1,
224         'febbraio' => 2,
225         'marzo' => 3,
226         'aprile' => 4,
227         'maggio' => 5,
228         'giugno' => 6,
229         'luglio' => 7,
230         'agosto' => 8,
231         'settembre' => 9,
232         'ottobre' => 10,
233         'novembre' => 11,
234         'dicembre' => 12,
235         // Spanish
236         'enero' => 1,
237         'febrero' => 2,
238         'marzo' => 3,
239         'abril' => 4,
240         'mayo' => 5,
241         'junio' => 6,
242         'julio' => 7,
243         'agosto' => 8,
244         'septiembre' => 9,
245         'setiembre' => 9,
246         'octubre' => 10,
247         'noviembre' => 11,
248         'diciembre' => 12,
249         // Finnish
250         'tammikuu' => 1,
251         'helmikuu' => 2,
252         'maaliskuu' => 3,
253         'huhtikuu' => 4,
254         'toukokuu' => 5,
255         'kesäkuu' => 6,
256         'heinäkuu' => 7,
257         'elokuu' => 8,
258         'suuskuu' => 9,
259         'lokakuu' => 10,
260         'marras' => 11,
261         'joulukuu' => 12,
262         // Hungarian
263         'január' => 1,
264         'február' => 2,
265         'március' => 3,
266         'április' => 4,
267         'május' => 5,
268         'június' => 6,
269         'július' => 7,
270         'augusztus' => 8,
271         'szeptember' => 9,
272         'október' => 10,
273         'november' => 11,
274         'december' => 12,
275         // Greek
276         'Ιαν' => 1,
277         'Φεβ' => 2,
278         'Μάώ' => 3,
279         'Μαώ' => 3,
280         'Απρ' => 4,
281         'Μάι' => 5,
282         'Μαϊ' => 5,
283         'Μαι' => 5,
284         'Ιούν' => 6,
285         'Ιον' => 6,
286         'Ιούλ' => 7,
287         'Ιολ' => 7,
288         'Αύγ' => 8,
289         'Αυγ' => 8,
290         'Σεπ' => 9,
291         'Οκτ' => 10,
292         'Νοέ' => 11,
293         'Δεκ' => 12,
294     );
295 
296     /**
297      * List of timezones, abbreviation => offset from UTC
298      *
299      * @access protected
300      * @var array
301      */
302     var $timezone = array(
303         'ACDT' => 37800,
304         'ACIT' => 28800,
305         'ACST' => 34200,
306         'ACT' => -18000,
307         'ACWDT' => 35100,
308         'ACWST' => 31500,
309         'AEDT' => 39600,
310         'AEST' => 36000,
311         'AFT' => 16200,
312         'AKDT' => -28800,
313         'AKST' => -32400,
314         'AMDT' => 18000,
315         'AMT' => -14400,
316         'ANAST' => 46800,
317         'ANAT' => 43200,
318         'ART' => -10800,
319         'AZOST' => -3600,
320         'AZST' => 18000,
321         'AZT' => 14400,
322         'BIOT' => 21600,
323         'BIT' => -43200,
324         'BOT' => -14400,
325         'BRST' => -7200,
326         'BRT' => -10800,
327         'BST' => 3600,
328         'BTT' => 21600,
329         'CAST' => 18000,
330         'CAT' => 7200,
331         'CCT' => 23400,
332         'CDT' => -18000,
333         'CEDT' => 7200,
334         'CET' => 3600,
335         'CGST' => -7200,
336         'CGT' => -10800,
337         'CHADT' => 49500,
338         'CHAST' => 45900,
339         'CIST' => -28800,
340         'CKT' => -36000,
341         'CLDT' => -10800,
342         'CLST' => -14400,
343         'COT' => -18000,
344         'CST' => -21600,
345         'CVT' => -3600,
346         'CXT' => 25200,
347         'DAVT' => 25200,
348         'DTAT' => 36000,
349         'EADT' => -18000,
350         'EAST' => -21600,
351         'EAT' => 10800,
352         'ECT' => -18000,
353         'EDT' => -14400,
354         'EEST' => 10800,
355         'EET' => 7200,
356         'EGT' => -3600,
357         'EKST' => 21600,
358         'EST' => -18000,
359         'FJT' => 43200,
360         'FKDT' => -10800,
361         'FKST' => -14400,
362         'FNT' => -7200,
363         'GALT' => -21600,
364         'GEDT' => 14400,
365         'GEST' => 10800,
366         'GFT' => -10800,
367         'GILT' => 43200,
368         'GIT' => -32400,
369         'GST' => 14400,
370         'GST' => -7200,
371         'GYT' => -14400,
372         'HAA' => -10800,
373         'HAC' => -18000,
374         'HADT' => -32400,
375         'HAE' => -14400,
376         'HAP' => -25200,
377         'HAR' => -21600,
378         'HAST' => -36000,
379         'HAT' => -9000,
380         'HAY' => -28800,
381         'HKST' => 28800,
382         'HMT' => 18000,
383         'HNA' => -14400,
384         'HNC' => -21600,
385         'HNE' => -18000,
386         'HNP' => -28800,
387         'HNR' => -25200,
388         'HNT' => -12600,
389         'HNY' => -32400,
390         'IRDT' => 16200,
391         'IRKST' => 32400,
392         'IRKT' => 28800,
393         'IRST' => 12600,
394         'JFDT' => -10800,
395         'JFST' => -14400,
396         'JST' => 32400,
397         'KGST' => 21600,
398         'KGT' => 18000,
399         'KOST' => 39600,
400         'KOVST' => 28800,
401         'KOVT' => 25200,
402         'KRAST' => 28800,
403         'KRAT' => 25200,
404         'KST' => 32400,
405         'LHDT' => 39600,
406         'LHST' => 37800,
407         'LINT' => 50400,
408         'LKT' => 21600,
409         'MAGST' => 43200,
410         'MAGT' => 39600,
411         'MAWT' => 21600,
412         'MDT' => -21600,
413         'MESZ' => 7200,
414         'MEZ' => 3600,
415         'MHT' => 43200,
416         'MIT' => -34200,
417         'MNST' => 32400,
418         'MSDT' => 14400,
419         'MSST' => 10800,
420         'MST' => -25200,
421         'MUT' => 14400,
422         'MVT' => 18000,
423         'MYT' => 28800,
424         'NCT' => 39600,
425         'NDT' => -9000,
426         'NFT' => 41400,
427         'NMIT' => 36000,
428         'NOVST' => 25200,
429         'NOVT' => 21600,
430         'NPT' => 20700,
431         'NRT' => 43200,
432         'NST' => -12600,
433         'NUT' => -39600,
434         'NZDT' => 46800,
435         'NZST' => 43200,
436         'OMSST' => 25200,
437         'OMST' => 21600,
438         'PDT' => -25200,
439         'PET' => -18000,
440         'PETST' => 46800,
441         'PETT' => 43200,
442         'PGT' => 36000,
443         'PHOT' => 46800,
444         'PHT' => 28800,
445         'PKT' => 18000,
446         'PMDT' => -7200,
447         'PMST' => -10800,
448         'PONT' => 39600,
449         'PST' => -28800,
450         'PWT' => 32400,
451         'PYST' => -10800,
452         'PYT' => -14400,
453         'RET' => 14400,
454         'ROTT' => -10800,
455         'SAMST' => 18000,
456         'SAMT' => 14400,
457         'SAST' => 7200,
458         'SBT' => 39600,
459         'SCDT' => 46800,
460         'SCST' => 43200,
461         'SCT' => 14400,
462         'SEST' => 3600,
463         'SGT' => 28800,
464         'SIT' => 28800,
465         'SRT' => -10800,
466         'SST' => -39600,
467         'SYST' => 10800,
468         'SYT' => 7200,
469         'TFT' => 18000,
470         'THAT' => -36000,
471         'TJT' => 18000,
472         'TKT' => -36000,
473         'TMT' => 18000,
474         'TOT' => 46800,
475         'TPT' => 32400,
476         'TRUT' => 36000,
477         'TVT' => 43200,
478         'TWT' => 28800,
479         'UYST' => -7200,
480         'UYT' => -10800,
481         'UZT' => 18000,
482         'VET' => -14400,
483         'VLAST' => 39600,
484         'VLAT' => 36000,
485         'VOST' => 21600,
486         'VUT' => 39600,
487         'WAST' => 7200,
488         'WAT' => 3600,
489         'WDT' => 32400,
490         'WEST' => 3600,
491         'WFT' => 43200,
492         'WIB' => 25200,
493         'WIT' => 32400,
494         'WITA' => 28800,
495         'WKST' => 18000,
496         'WST' => 28800,
497         'YAKST' => 36000,
498         'YAKT' => 32400,
499         'YAPT' => 36000,
500         'YEKST' => 21600,
501         'YEKT' => 18000,
502     );
503 
504     /**
505      * Cached PCRE for SimplePie_Parse_Date::$day
506      *
507      * @access protected
508      * @var string
509      */
510     var $day_pcre;
511 
512     /**
513      * Cached PCRE for SimplePie_Parse_Date::$month
514      *
515      * @access protected
516      * @var string
517      */
518     var $month_pcre;
519 
520     /**
521      * Array of user-added callback methods
522      *
523      * @access private
524      * @var array
525      */
526     var $built_in = array();
527 
528     /**
529      * Array of user-added callback methods
530      *
531      * @access private
532      * @var array
533      */
534     var $user = array();
535 
536     /**
537      * Create new SimplePie_Parse_Date object, and set self::day_pcre,
538      * self::month_pcre, and self::built_in
539      *
540      * @access private
541      */
542     public function __construct()
543     {
544         $this->day_pcre = '(' . implode(array_keys($this->day), '|') . ')';
545         $this->month_pcre = '(' . implode(array_keys($this->month), '|') . ')';
546 
547         static $cache;
548         if (!isset($cache[get_class($this)]))
549         {
550             $all_methods = get_class_methods($this);
551 
552             foreach ($all_methods as $method)
553             {
554                 if (strtolower(substr($method, 0, 5)) === 'date_')
555                 {
556                     $cache[get_class($this)][] = $method;
557                 }
558             }
559         }
560 
561         foreach ($cache[get_class($this)] as $method)
562         {
563             $this->built_in[] = $method;
564         }
565     }
566 
567     /**
568      * Get the object
569      *
570      * @access public
571      */
572     public static function get()
573     {
574         static $object;
575         if (!$object)
576         {
577             $object = new SimplePie_Parse_Date;
578         }
579         return $object;
580     }
581 
582     /**
583      * Parse a date
584      *
585      * @final
586      * @access public
587      * @param string $date Date to parse
588      * @return int Timestamp corresponding to date string, or false on failure
589      */
590     public function parse($date)
591     {
592         foreach ($this->user as $method)
593         {
594             if (($returned = call_user_func($method, $date)) !== false)
595             {
596                 return $returned;
597             }
598         }
599 
600         foreach ($this->built_in as $method)
601         {
602             if (($returned = call_user_func(array($this, $method), $date)) !== false)
603             {
604                 return $returned;
605             }
606         }
607 
608         return false;
609     }
610 
611     /**
612      * Add a callback method to parse a date
613      *
614      * @final
615      * @access public
616      * @param callback $callback
617      */
618     public function add_callback($callback)
619     {
620         if (is_callable($callback))
621         {
622             $this->user[] = $callback;
623         }
624         else
625         {
626             trigger_error('User-supplied function must be a valid callback', E_USER_WARNING);
627         }
628     }
629 
630     /**
631      * Parse a superset of W3C-DTF (allows hyphens and colons to be omitted, as
632      * well as allowing any of upper or lower case "T", horizontal tabs, or
633      * spaces to be used as the time seperator (including more than one))
634      *
635      * @access protected
636      * @return int Timestamp
637      */
638     public function date_w3cdtf($date)
639     {
640         static $pcre;
641         if (!$pcre)
642         {
643             $year = '([0-9]{4})';
644             $month = $day = $hour = $minute = $second = '([0-9]{2})';
645             $decimal = '([0-9]*)';
646             $zone = '(?:(Z)|([+\-])([0-9]{1,2}):?([0-9]{1,2}))';
647             $pcre = '/^' . $year . '(?:-?' . $month . '(?:-?' . $day . '(?:[Tt\x09\x20]+' . $hour . '(?::?' . $minute . '(?::?' . $second . '(?:.' . $decimal . ')?)?)?' . $zone . ')?)?)?$/';
648         }
649         if (preg_match($pcre, $date, $match))
650         {
651             /*
652             Capturing subpatterns:
653             1: Year
654             2: Month
655             3: Day
656             4: Hour
657             5: Minute
658             6: Second
659             7: Decimal fraction of a second
660             8: Zulu
661             9: Timezone ±
662             10: Timezone hours
663             11: Timezone minutes
664             */
665 
666             // Fill in empty matches
667             for ($i = count($match); $i <= 3; $i++)
668             {
669                 $match[$i] = '1';
670             }
671 
672             for ($i = count($match); $i <= 7; $i++)
673             {
674                 $match[$i] = '0';
675             }
676 
677             // Numeric timezone
678             if (isset($match[9]) && $match[9] !== '')
679             {
680                 $timezone = $match[10] * 3600;
681                 $timezone += $match[11] * 60;
682                 if ($match[9] === '-')
683                 {
684                     $timezone = 0 - $timezone;
685                 }
686             }
687             else
688             {
689                 $timezone = 0;
690             }
691 
692             // Convert the number of seconds to an integer, taking decimals into account
693             $second = round($match[6] + $match[7] / pow(10, strlen($match[7])));
694 
695             return gmmktime($match[4], $match[5], $second, $match[2], $match[3], $match[1]) - $timezone;
696         }
697         else
698         {
699             return false;
700         }
701     }
702 
703     /**
704      * Remove RFC822 comments
705      *
706      * @access protected
707      * @param string $data Data to strip comments from
708      * @return string Comment stripped string
709      */
710     public function remove_rfc2822_comments($string)
711     {
712         $string = (string) $string;
713         $position = 0;
714         $length = strlen($string);
715         $depth = 0;
716 
717         $output = '';
718 
719         while ($position < $length && ($pos = strpos($string, '(', $position)) !== false)
720         {
721             $output .= substr($string, $position, $pos - $position);
722             $position = $pos + 1;
723             if ($string[$pos - 1] !== '\\')
724             {
725                 $depth++;
726                 while ($depth && $position < $length)
727                 {
728                     $position += strcspn($string, '()', $position);
729                     if ($string[$position - 1] === '\\')
730                     {
731                         $position++;
732                         continue;
733                     }
734                     elseif (isset($string[$position]))
735                     {
736                         switch ($string[$position])
737                         {
738                             case '(':
739                                 $depth++;
740                                 break;
741 
742                             case ')':
743                                 $depth--;
744                                 break;
745                         }
746                         $position++;
747                     }
748                     else
749                     {
750                         break;
751                     }
752                 }
753             }
754             else
755             {
756                 $output .= '(';
757             }
758         }
759         $output .= substr($string, $position);
760 
761         return $output;
762     }
763 
764     /**
765      * Parse RFC2822's date format
766      *
767      * @access protected
768      * @return int Timestamp
769      */
770     public function date_rfc2822($date)
771     {
772         static $pcre;
773         if (!$pcre)
774         {
775             $wsp = '[\x09\x20]';
776             $fws = '(?:' . $wsp . '+|' . $wsp . '*(?:\x0D\x0A' . $wsp . '+)+)';
777             $optional_fws = $fws . '?';
778             $day_name = $this->day_pcre;
779             $month = $this->month_pcre;
780             $day = '([0-9]{1,2})';
781             $hour = $minute = $second = '([0-9]{2})';
782             $year = '([0-9]{2,4})';
783             $num_zone = '([+\-])([0-9]{2})([0-9]{2})';
784             $character_zone = '([A-Z]{1,5})';
785             $zone = '(?:' . $num_zone . '|' . $character_zone . ')';
786             $pcre = '/(?:' . $optional_fws . $day_name . $optional_fws . ',)?' . $optional_fws . $day . $fws . $month . $fws . $year . $fws . $hour . $optional_fws . ':' . $optional_fws . $minute . '(?:' . $optional_fws . ':' . $optional_fws . $second . ')?' . $fws . $zone . '/i';
787         }
788         if (preg_match($pcre, $this->remove_rfc2822_comments($date), $match))
789         {
790             /*
791             Capturing subpatterns:
792             1: Day name
793             2: Day
794             3: Month
795             4: Year
796             5: Hour
797             6: Minute
798             7: Second
799             8: Timezone ±
800             9: Timezone hours
801             10: Timezone minutes
802             11: Alphabetic timezone
803             */
804 
805             // Find the month number
806             $month = $this->month[strtolower($match[3])];
807 
808             // Numeric timezone
809             if ($match[8] !== '')
810             {
811                 $timezone = $match[9] * 3600;
812                 $timezone += $match[10] * 60;
813                 if ($match[8] === '-')
814                 {
815                     $timezone = 0 - $timezone;
816                 }
817             }
818             // Character timezone
819             elseif (isset($this->timezone[strtoupper($match[11])]))
820             {
821                 $timezone = $this->timezone[strtoupper($match[11])];
822             }
823             // Assume everything else to be -0000
824             else
825             {
826                 $timezone = 0;
827             }
828 
829             // Deal with 2/3 digit years
830             if ($match[4] < 50)
831             {
832                 $match[4] += 2000;
833             }
834             elseif ($match[4] < 1000)
835             {
836                 $match[4] += 1900;
837             }
838 
839             // Second is optional, if it is empty set it to zero
840             if ($match[7] !== '')
841             {
842                 $second = $match[7];
843             }
844             else
845             {
846                 $second = 0;
847             }
848 
849             return gmmktime($match[5], $match[6], $second, $month, $match[2], $match[4]) - $timezone;
850         }
851         else
852         {
853             return false;
854         }
855     }
856 
857     /**
858      * Parse RFC850's date format
859      *
860      * @access protected
861      * @return int Timestamp
862      */
863     public function date_rfc850($date)
864     {
865         static $pcre;
866         if (!$pcre)
867         {
868             $space = '[\x09\x20]+';
869             $day_name = $this->day_pcre;
870             $month = $this->month_pcre;
871             $day = '([0-9]{1,2})';
872             $year = $hour = $minute = $second = '([0-9]{2})';
873             $zone = '([A-Z]{1,5})';
874             $pcre = '/^' . $day_name . ',' . $space . $day . '-' . $month . '-' . $year . $space . $hour . ':' . $minute . ':' . $second . $space . $zone . '$/i';
875         }
876         if (preg_match($pcre, $date, $match))
877         {
878             /*
879             Capturing subpatterns:
880             1: Day name
881             2: Day
882             3: Month
883             4: Year
884             5: Hour
885             6: Minute
886             7: Second
887             8: Timezone
888             */
889 
890             // Month
891             $month = $this->month[strtolower($match[3])];
892 
893             // Character timezone
894             if (isset($this->timezone[strtoupper($match[8])]))
895             {
896                 $timezone = $this->timezone[strtoupper($match[8])];
897             }
898             // Assume everything else to be -0000
899             else
900             {
901                 $timezone = 0;
902             }
903 
904             // Deal with 2 digit year
905             if ($match[4] < 50)
906             {
907                 $match[4] += 2000;
908             }
909             else
910             {
911                 $match[4] += 1900;
912             }
913 
914             return gmmktime($match[5], $match[6], $match[7], $month, $match[2], $match[4]) - $timezone;
915         }
916         else
917         {
918             return false;
919         }
920     }
921 
922     /**
923      * Parse C99's asctime()'s date format
924      *
925      * @access protected
926      * @return int Timestamp
927      */
928     public function date_asctime($date)
929     {
930         static $pcre;
931         if (!$pcre)
932         {
933             $space = '[\x09\x20]+';
934             $wday_name = $this->day_pcre;
935             $mon_name = $this->month_pcre;
936             $day = '([0-9]{1,2})';
937             $hour = $sec = $min = '([0-9]{2})';
938             $year = '([0-9]{4})';
939             $terminator = '\x0A?\x00?';
940             $pcre = '/^' . $wday_name . $space . $mon_name . $space . $day . $space . $hour . ':' . $min . ':' . $sec . $space . $year . $terminator . '$/i';
941         }
942         if (preg_match($pcre, $date, $match))
943         {
944             /*
945             Capturing subpatterns:
946             1: Day name
947             2: Month
948             3: Day
949             4: Hour
950             5: Minute
951             6: Second
952             7: Year
953             */
954 
955             $month = $this->month[strtolower($match[2])];
956             return gmmktime($match[4], $match[5], $match[6], $month, $match[3], $match[7]);
957         }
958         else
959         {
960             return false;
961         }
962     }
963 
964     /**
965      * Parse dates using strtotime()
966      *
967      * @access protected
968      * @return int Timestamp
969      */
970     public function date_strtotime($date)
971     {
972         $strtotime = strtotime($date);
973         if ($strtotime === -1 || $strtotime === false)
974         {
975             return false;
976         }
977         else
978         {
979             return $strtotime;
980         }
981     }
982 }
983 
984
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